Telephone



(No Model.)

J. GOODMAN. TELEPHONE.

No. 243,883. Y 1 Patented July 5-, 1881..

WiTNESSES mvENToR /%M 4 v ATTORNEYS UNITED STATES PATENT Q FICE.

JOHN GOODMAN, OF'LOUISVILLE, KENTUCKY.

TELEPHONE.

SPECIFICATION forming part of Letters Patent No. 243,883, dated July 5,1881. Application tiled April 28, 1881. (No model.)

To all whom it may concern Be it known that I, JOHN GOODMAN, a citizenof the United States, resident 'at Louisville, in the county ofJefierson and State of Kentucky, have invented a new and valuableImprovement in Instruments for the Production and Reproduction of Soundsby Means of an Electric Current; and I do hereby declare that thefollowing is a full, clear, and exact description of the constructionand operation of the same, reference being bad to the an- .nexeddrawings, making a part of this specification, and to the letters andfigures of reference marked thereon.

Figure 1 of the drawings is a representation of the instrument in itssimplest form, (diagrammatic.) Fig.2 isasectional view ofa more perfectinstrument.

The present invention has relation to that class ot'instruments by meansof which sounds, articulate and otherwise, are produced or reproducedthrough the agency of electricity at a distance from the transmittingstation.

In a prior Patent, No. 234,578, November 30, 1880,1 described one formof instrument of this kind based upon the principle of the ordinarygalvanometer-that is, in which the resonator or diaphragm is thrown intovibration by means of a magnet in combination with a conductor ofelectricity or helix, the two hearing such a relation to each other thatwhen a currentof electricity is passed through the conductor the magnetwill tend to assume a position at right angles therewith. I now presentand desire to obtain Letters Patent for another form of this instrument.

In the accompanying drawings, Fig. 1 is a diagrammatic represention ofthe simplest form of the instrument under consideration. 0 is asectional View of a flattened helix. D is a magnet pivoted at itscenter, the pivot being passed through a hole in the center of thehelix. B is a diaphragm or resonator, and

R is a delicate rod connecting the diaphragm with the magnet. If elasticpressure were brought to bear upon any part of the magnet, so as topress it toward or from the diaphragm, the instrument would come withinthe class already described by me in the patent alluded to. The relativeposition of the different parts of this instrument may be alteredwithout affecting the fundamental principles of its construction.

Fig. 2 represents a sectional view of a more perfect form of theinstrument. F is a case, of wood, rubber, or composition. 0 is asectional view of a flattened helix. D and D are magnets arranged in twoseries,with like poles toward the central line of the helix. A and A areear-pieces. B and B are diaphragms, one at each end of the instrument;and R is a connecting rod, cord, or wire extending from one diaphragm tothe other, to which the magnets are attached at the central line of thehelix. The second diaphragm being actuated synchronously with-the first,and the movements being in the same direction, the sound is therebyintensified.

I claim- 1. A conductor and a centrally-pivoted magnet arranged paralleltherewith, in combination with a diaphragm and means for connecting themagnet to the diaphragm, substantially as setforth.

2. A conductor and acentrally-pivoted magnet arranged paralleltherewith, in combination with two diaphragms and means for connectingsaid diaphragms to the magnet, substantially as set forth.

In testimony that I claim the above I have hereunto subscribed my namein the presence of two witnesses.

JOHN GOODMAN.

Witnesses:

THEO. DAVIS, SAML. P. WALKER.

